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Motor and disk drive including the same

a technology of electric motors and disk drives, applied in the direction of magnetic circuit rotating parts, magnetic circuit shapes/forms/construction, instruments, etc., can solve the problems of reducing the strength increasing the probability of deformation of the base portion, and limited reduction of the thickness of the base portion

Inactive Publication Date: 2008-01-17
NIPPON DENSAN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]Other features, elements, advantages and characteristics of the present invention will become more apparent

Problems solved by technology

However, as the thickness of the base portion is reduced, the strength thereof is lowered and it is going to be more likely that the base portion is deformed by impact applied from the outside and resonance with various vibrations.
The

Method used

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  • Motor and disk drive including the same
  • Motor and disk drive including the same
  • Motor and disk drive including the same

Examples

Experimental program
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first preferred embodiment

[0028]FIG. 1 is a vertical cross-sectional view of a disk drive 60 including an electric spindle motor 1 (hereinafter, simply referred to as a motor) according to a first embodiment of the present invention. For example, the disk drive 60 is a hard disk drive. The disk drive 60 includes: a disk-shaped storage medium (hereinafter, simply referred to as a disk) 62 in the form of a generally circular plate, capable of storing information; an access portion 63 carrying out at least one of reading information from and writing information on the disk 62; the electric motor 1 for holding and rotating the disk 62; and a housing 61 defining an internal space 610 in which the disk 62, the access portion 63, and the motor 1 are accommodated. In this preferred embodiment, the disk 62 is a 1.8-inch disk, for example.

[0029]As shown in FIG. 1, the housing 61 includes a first housing member 611 and a second housing member 612. The first housing member 611 is a generally box-shaped member with no li...

second preferred embodiment

[0056]A motor according to a second preferred embodiment of the present invention is now described. FIG. 5 is a vertical cross-sectional view of the motor la of the second preferred embodiment. FIG. 6 is a plan view of a base plate 21a of the motor 1a. As shown in FIGS. 5 and 6, the base plate 21a in the motor 1 is provided with a plurality of ribs 213a having a different length from that of the rib 213 of the motor 1 shown in FIG. 4. Moreover, no armature supporting portion 214 is provided in the base plate 21a. Except for the above, the structure of the motor la is the same as that of the motor 1 shown in FIGS. 1 to 4. Therefore, like parts are given like reference numerals in FIGS. 5 and 6.

[0057]Referring to FIG. 6, the base plate 21a has the ribs 213a in all regions between the holes 211, as in the first preferred embodiment. The ribs 213a project from the upper surface of the base plate 21a toward the armature 24 (see FIG. 5). In this preferred embodiment, nine ribs 213 are pro...

third preferred embodiment

[0062]A motor according to a third preferred embodiment of the present invention is now described. FIG. 7 is a plan view of a base plate 21b of the motor of the third preferred embodiment. As shown in FIG. 7, the base plate 21b is provided with other convex portions 215 extending generally along a circumferential direction about the center axis J1, in addition to the ribs 213 shown in FIG. 4. As the other convex portions 215, ribs are provided. In this preferred embodiment, nine ribs 215 are provided. In the following description, the ribs 213 and 215 are distinguished from each other by using the terms “the first ribs 213” and “the second ribs 215”. Except for the above, the structure of the motor in this preferred embodiment is the same as that in the first preferred embodiment. Therefore, like parts are given like reference numerals in FIG. 7.

[0063]As shown in FIG. 7, the first ribs 213 cross the line 2111 generally perpendicularly there to as in the first embodiment. Please note...

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Abstract

A base plate serving as a base portion of a motor has a plurality of coil-receiving portions in regions corresponding to a plurality of teeth and coils, respectively. Each coil-receiving portion receives a lower portion of a corresponding coil. The axial thickness of the base plate and that of the motor can be reduced by forming the base plate by pressing. The base plate is provided with a projection formed thereon. The projection extends generally in a direction perpendicular to a center axis of the motor between the coil-receiving portions. The projection is arranged to cross a line connecting closest portions of two coil-receiving portions to each other. Thus, a portion of the base plate having the lowest strength is reinforced and therefore the strength of the base plate is increased.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an electric motor and a disk drive including the same.[0003]2. Description of the Related Art[0004]Disk drives such as hard disk drives include spindle motors (hereinafter, simply referred to as motors) which rotate disk-shaped storage media. The disk drives are incorporated in many portable music players and the like, and are therefore required to have a large capacity and be small and thin. In accordance with this, the motors as driving sources of the disk drives are also required to be small and thin.[0005]The motors can be made thin, for example, by reducing the thickness of a base portion in a motor which supports various components of the motor. However, as the thickness of the base portion is reduced, the strength thereof is lowered and it is going to be more likely that the base portion is deformed by impact applied from the outside and resonance with various vibrations. In order...

Claims

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Application Information

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IPC IPC(8): H02K1/22G11B5/52
CPCG11B17/028H02K5/04H02K1/185G11B19/2009
Inventor TAMAOKA, TAKEHITOSUGINOBU, SHINGO
Owner NIPPON DENSAN CORP